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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47699fdb4dd6c36f8c04a4c860d3730434f02e80d0ea53737c12a72b6b86d988' 
  AND token = '68U4o0nE0/QG/tAO3L6jnl+W1O6xnyZ0/7ARlTT8odM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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