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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1676f3492cb2279c6a90a4c894954164a02b5a851db0bb3e77d19d13405482e0' 
  AND token = 'McOVpCTt1tiEdL/EqvX1CdpCgpZ54GjSRlNWi4wzZ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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