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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9991ba45258180bcac7597d97670737c08cfcd7cd35e56938c15f7bdcf3ff75' 
  AND token = 'uinRTqbV07jIF1AOboml+cMtIvoYTuf8ATcfix/AAKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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