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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11db7c617c8ef04495e9b0d7ff752664c4252e489dafb10a53ee1b5829b71804' 
  AND token = '4QFKA4TvL7HtIOYf8IKTLwwO/FO4wee3l8UkjMHNm+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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