SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d807428b6e1f833a914128d5d578d60e376a1cdfcbc0aef187ba7a3b3c412c' 
  AND token = 'gO/WkMHF5vKrOwHWQP0gmHD5oT+fubkIGNJcYurVnLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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