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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f1a65c4a725720967b277fc08dd73c97440dd013b35317ea06c1aabdbe0f46' 
  AND token = 'Obks8H1033tEYuNraUuXIws1ZMZMrMGOPbiRuCL1kCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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