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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b99bb4ff5cc6090139a29873438833501635976f54e2a2893619834cf08d21' 
  AND token = '4g3by7o1605o+OmdVJLi/NefxldRabsUqjX1gvDs44E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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