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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863c06a465f7f840bf1fa868a985939942051dc8ba703ddc299eca405b2bf503' 
  AND token = 'qIpZMPh+kttweP3yIDuDax9SUhoH5fltV18Nm0EoxWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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