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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5979cde9f4460b261aa6d281f0d6e27543bee82e63426cdd3f5c43d3dd84e46d' 
  AND token = '0svcZtgv2nCFQacZi5cL/jh+AbD2vo+KfbtAQmYfpUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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