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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9de250a2a3ba1d87427fc48e8dbac27011dde828a81d5810a549780f4be7c7' 
  AND token = '4ayxKpG0ZnawWGVERJEd27M3T6kFHNy779pbmGRzo0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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