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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd512b3a8a3b70366fb663be76cd98ad3a5e5f432f8005193d7541226ff7723d2' 
  AND token = 'A7rNRlVQIpuFHnGkh8ZnduHfshBfnnmpQ/b8MQeIG7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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