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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2066cf3fca3ec9373f33458cb5145c5baffaff2978b6df120c30f98d60a7bba1' 
  AND token = '/wnBuwNQB2acs/iQFd75MJm5uGRaPefc8F3lu6Zuqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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