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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35845dbdd1de9078d72bfd96d3c9cc5ce59dcc9e5470236a9745e275390a2828' 
  AND token = 'sUoPcxoRqPCV69WCnUnaneQERMJWvn7GTQTchsyiyfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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