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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe451a68615b6f2a8278cce6bd6f22802b17aab0e57d4070b123de3cb0cc399' 
  AND token = 'poSMdyViQoC02bcRKYQ2AR1IREECfMdmWRfQSSNFF5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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