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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909f801fc799d95872bcfde2b71611e8143cef93eda4d94917be908b9c4e7bd4' 
  AND token = '7YAOYZv0zmaMSLWoCCxz9ZQ0zzZ4H8DWAcWYYtQQ20A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}