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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2aa8727d6cc0ddbb425fc1e8cf08ab59dafc0dc58c99ca1b9e9a6a0e48c9e3' 
  AND token = 't2YveGgbbrMu/sWG/MFxWf4POqP3/anTiF4YBhpn9Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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