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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c434260852032a012aee83b0769681c271641a19c542810177dd29559ff108b4' 
  AND token = 'vtGrpHCvICTfI1rdTgURzbN8J+SJY2GfdL20Eirfez0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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