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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410de3c6e2bfbb3146590c61c622cd07d10acf85c0b2e91c04e650bb084af25c' 
  AND token = '3Kd6rVBHtGXlc1dnwL6UmEp13OfR3O3SPA/e7RB5KCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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