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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd687c5c9d93399c7831253c5bdf5ba88c157c72d9f1d3e5cf2e66922ba76f' 
  AND token = 'FiiYLNESI+7MpJbIBcxMis1e/2R///EkQ7QVr2mqc5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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