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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11873aeb081154924141bde93e5921bbf0e205b382690ec77f138e321df816fa' 
  AND token = '+PWZB+Msmm8KE40EX/QNtpGHHa769kgQXIsSKUc17N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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