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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477e6efdecf1607f789b47c368def2818cb47329e61e4cfe67c6ba632dd19871' 
  AND token = 'j3w/aFxWWXNp1zoNrpLPRBcgb1VssEiyE9zSAKmehGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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