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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb9b1cce86f8206abba8526494cf9c5ec336b960264fd5f7d2839580cf8f617' 
  AND token = 'czijMl9lVA9y2FGCzrBFPtDb5SiMvyoB2+ULRJ+1X64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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