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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9c76ef7671e85628495e27cae921dc36a8e112ed096e4c8d64f0466df3ec52' 
  AND token = 'fQ6a1n29FVi4StQfpBZmDdVXilRUStl1ovHeXZTTyQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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