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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a714d462aa5eb78b05ae2bccb9d0e2a4fb42518895ea36bd9e5c86dcb75ad2' 
  AND token = 'N1jt+J+JV7RaGyBymxUY9oitAAyILpZ2VNLUDJKR9JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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