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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b272940385f4e117593008dec0eaee4958811307a93747884eb0aa1704f49d' 
  AND token = 'H1uUb0OKPi5PPS2kvfNnQ6tsFoz68kIiep3mWT8QVLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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