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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fafb4d9f21acc0b4d8102ebfe7e29c1349ce74cb5a0bed75544ff86f4caf27' 
  AND token = 'r7KuqX+YXIm32Y8jVtYePOSfmVQZIPmJUf85a/pnfoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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