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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af3057f87ef015ac47a90255a5bcd9a81d071af89b66713d5af1f4085830982' 
  AND token = 'N5haJKMhwvPIogt6PPBNc7+1msEDPNn/tR7EEkuNjZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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