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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae949a9bb3477b7e3e12f6deeb5787af1d35aa5a1255342f1472f50b23d5d4b2' 
  AND token = '39MebWnbk9Zsw5rmIwnYSQy1B+Am9le7hHOZIGx3jbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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