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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c70dc564c750af90c92593a964a2f6818d1dddf0aa9a8720f42580ab2490c0' 
  AND token = 'CuNn/f8CvlzEWS5BjkPx/jw+w0jtjasQ2DqeU3uQfxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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