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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c865d42d3e76ec486a20084751fc8cb536ae46f6b64bf556ec3bca0b10060b0' 
  AND token = 'akh2K1rRVL4LPurA1Bdb33rKFvmejUf78Or2rQvX0QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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