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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b984fd0f450a7b6cdda9af9f10ba1d57ae7e685b98f3c51ce98e01a5c59f3567' 
  AND token = 'KUeg4em9k74o9ZsUV96yCt+r8HFjBqaaROSbZc9WJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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