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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daba000d947586934a64f297ad69c6a4cfd59b8c0edf8ca54ba512bb9193b96b' 
  AND token = 'c1tRg+m7F3fBuqQ8JMQamwBSxFJgYY993lSnzthtFq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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