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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c4f68b34f91de94050dcf81e1fcb5f9b96202f0ff7c22df69ace66fb05a517' 
  AND token = 'uZVkwUQMBfA97uJJb7BDVFQOf65FLgVvCckSZx9OH04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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