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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fc2decca5af3d78fa03c4b6ed2cef4ea33d1f95c3a168367063482dcc1ef71' 
  AND token = 'Chq8x6DiSWNB78iQE7EJc6bXm3XMmcWZjaHVdI0Harg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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