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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97754905ace5bbe85d04ee8f8071a8577af8c06bf0d4f8bcf08ca04ad454db7e' 
  AND token = 'D2wqKcEZkTbrHY9Ay0Atrnxp6er3ZGtsibUevC1U2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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