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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6b5eb4483cc42a86fb474f3b43191f9bd364f27e671700c948871f04ed9022' 
  AND token = 'D+c3eG7/a69d/vzQAslOyFyVBbke+d46oCqXXwRC8s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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