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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fa4190c8246decf9f721b4418683646707c9cf1f2e4605f5b816da89525140' 
  AND token = '3rKT88pqNXQ13kycIuIfMNPyHNaRBSRPhhVcmsap4RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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