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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc91e0d68e854e027d50d8bb29397b746a4f0a205521a1ba138ecd0dffd0b50' 
  AND token = '5WnlXfGJmyGaUvBTRZKrtP59D0b8u+ALRI+VLA/nlyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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