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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be608b95ad85584b88fc881e931ac9fe4c9e1a450426457c39ba48ebc0ee170c' 
  AND token = 'VpR4xfQskvLw01InomQjXG+fz/aqVMP/LpsfWNjbCCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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