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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e162c1f26f39f6e832ae69aadf0c526f87cc16158cd2d63037b7e73745818d9' 
  AND token = 'P8lhx1GgM977Chtc3OCINvwZxjY1rF2bLhAHK8PTtXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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