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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c0955005d44fea3dc6becb521f2520c20c2b8857481f3e59f192a2b8a88d67' 
  AND token = '801a3Pwi8cNDfUOJ7CeCXTJ9G9UBUwKPrUT/4rOX5TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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