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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ae2aa15294de1eb036460e3a6a84dd2f71f6af459828bbc2db80cb4c74d855' 
  AND token = '6BIOJHEOK8kGjOFkmPEpd1ROE4GmjTP24fSt8Q3lRZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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