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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7dbe06fb6cf59fbe288a6c0f5df97e0818a9ea3c584af636aadd3a1e641c53' 
  AND token = '9BIY+1BgNw22nIYkjGekK7Eo+HqnnqtVS215rbz2z2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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