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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdec17ebdce69d750c358f9ff8f1fa1febabfb44eadfbe19ad07c0dd8a5cd12' 
  AND token = 'U1d6+SUv5krtuqT7bT3WT442ViKyAqpE7QES6HjuVPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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