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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac4524e5f4256645ce52e8303b74287ef3355275935474ece9ea305a32f0ac9' 
  AND token = 'Q2Rv88wkP8Bd0PPZdithBzjBpFc/Z/ytJfA2rRvEsg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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