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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e68810e3b27ccded4bbc3340a84c799c76768f4b9aa9c19ab23c7edf6b5e11f' 
  AND token = '86BqVEjkd6e9DcXqw6AwvZ9opj9srKswVvZXs1Z2ojc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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