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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4009d1861ea2aba86ff9ab024f3c8996a6ed5989933fa5d200162bbed9f00e' 
  AND token = 'D+h7l1xOFB1Nqrh5YC2ZYtsdLxqVqsPp1C8EOK+oa1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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