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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f021b1f26a58df7dc36e9814e0dc5223056bef9b2b4a0c2c641913d7ca62b7d' 
  AND token = 'cH3MwzeITI2PLkVIXAJr9sY2sPLNHI/INifF+5rgL28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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