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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebb191eab0cbe91080f5a2dcbf8b7fb52ebbbff4bd377edcd5762eb305f5169' 
  AND token = 'hL6JCbdFJKPZhuO3oyHt38JUg00CWROUb3dHy6q/uCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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