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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a669c2bffe59e41458323a13528015ecbda2a1fa104e0c9a8b4a62978cea24de' 
  AND token = 'o6vnxyG7CIS0iLSXaB0maRX7pVrOGLW11zEQCCdCWiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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