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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edef6f79b2fecb2c2c706116a1cc1aaacdbd4e0b92e4fe740a54fe727a3e518f' 
  AND token = 'aQGrBJROEliTOhrzH2RE1VUwqedfgytlV7IpyM/+nbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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