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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d02aa66f2dd49fa3004285064b46116951c7e218660bfb715019698ad51d0e' 
  AND token = 'RToQdB1ieIiilNQ6bcUpLNjF7xPyFeL1YWsdAN0ryew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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