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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0756529f9ec732277b54ef390ac8b6ee56473989b5e428c488e7d3c3e38fd7' 
  AND token = '6CFAEehah8gHtBbZ4fSur0ZWfIq2bJP3tUJM1qHK5A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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