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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac31959ab00c2ff514ffec740c96309d0b032d90d16ba5b30fbe8b7d829f4949' 
  AND token = 'vL41QevFDKuTPHnFhV3+c9uR1K4DTCr38QQBzJOSl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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