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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b9af27408d0dfed8050b6c30d30b648062ca8434e0360f395f4d37b755668e' 
  AND token = 'sDZI9Ig+d+FzYg/9nAhu+muJWTqnk94Hw2AoXeF9UAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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