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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ef01bc052a1f9ee02833b6a4e987b19227f006c68f4f8724b224d261a30e1f' 
  AND token = 'gpbICUzNl5rWkI5BvYcte8QOye8E/Odw7yQicLkMLsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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