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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dab344a904d5319eba81fb3c9f39b036e83fe4a96b416bc44d10e3a484e711' 
  AND token = '1d0sFOX3XvNGs3xfy/7z5HG0FtN4WkWIzRSW27O/wuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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