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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6e30f7aa52dce6612e1ae88ea2d31fc05db0a4e39acba477af3dd67fd55d3d' 
  AND token = 'Rwr3gGBrAUDYnR6/ETDx5juLuhJ2HHCxiGhaZf9Bb3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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