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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7ad3e4bfde078a966ac05bbb89b47f69a1a57001a3fee4b467083bb7d5fcc7' 
  AND token = 'uzY2K0v3n5VPi6rsHMPq5XMZ+VEjUADF1Wia2I9c6+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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