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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac635fed99586034caffd6027e1593c75942d6c27a7d35cdc02af0490cab5e7' 
  AND token = 'VwMijB6rh84EREN6ZZ7iOtWXr9Bih0sEHozVuyWxd8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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