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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155c592c8634f2e7fe868ac96eba3e0519f04d80734ef2e2daba083e46493c28' 
  AND token = '3uoTtlzuye2si8T/mLbl0u3U0pcp3stpQ0IitY6fu1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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