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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fa1389aee314aaa862863edd45e9e14828eaa8b7c73222aacdfbaf6ed9a6b4' 
  AND token = 'f5NgjyvJq5H/G4gfQAgdBguBORvZGpppz6+zFy8yAGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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