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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dee17e9eb38d88b9150c6b7d7284a78421c6af26750aaaac132b036c1c9b1b9' 
  AND token = 'l30aTdqJCFCtlCSiskAoRQFqTQcB4cv+xgwzBklifVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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