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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5009e7b6f66cfc7f78935910941cbb200d495ccb1767df6652efa62fdd79ff5' 
  AND token = 'bXu76cqYYos03zmHmiFLrQqrSgQ5FEusvz8CwUsswXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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